fix: if else node (#1383)

* fix: if else node

* fix

* fix

packages/global/core/workflow/template/system/ifElse/constant.ts

@@ -20,6 +20,11 @@ export enum VariableConditionEnum {
   lengthLessThan = 'lengthLessThan',
   lengthLessThanOrEqualTo = 'lengthLessThanOrEqualTo'
 }
+export enum IfElseResultEnum {
+  IF = 'IF',
+  ELSE = 'ELSE',
+  ELSE_IF = 'ELSE IF'
+}
 
 export const stringConditionList = [
   { label: '为空', value: VariableConditionEnum.isEmpty },